Andebs eirikson vethe



April 1, 1930. A. E. VETHE 1,752,766

CALGULAT ING APPARATUS Filed Feb. 9, 1.926

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ByIWM/AO M44 Patented A pr. 1, 1930 i UNITED STATES PATENT! OFFICE .ANDERS EIRIKSON VETEE, F OSLO, NORWAY OALCULATIN G APPARATUS Application fled February 9, 1926, Serial No. 87,120, and in Norway February 10, 1925.

My invention relates to calculating a paratus of the type comprising a series 0 indicatmg discs rotatably mounted on axes in spaced relation to each other, with interme- '5 diate driving devices interposed between successive discs, each arranged to be driven by the 'disc to its right in the series and arranged to drive the disc to its left, 7 It is the object of my invention to provide improved interme- 0 diate driving devices adapted to cooperate with suitable justifying means whereby the indicating disc at the end of the series can be given a complete single step movement in either direction by power applied tothe indicating disc at the opposite end of'theseries with the power acting through only a similar single ste distance. For accomplishing this object, I'liave provided intermediate rotarydriving devices, each having short broad tooth portions by which power is applied to the device from the indicating disc at the right and having comparatively longer and narrower tooth portions projecting outwardly in centered position with respect to the short broad tooth portions for applying power from the device to the indicating disc attheleft.

It is another improvedevices of this type in sundry details hereinafter pointed out. i The referred means by I-=-have accompllshed my objects are illustrated in the drawing and are hereinafter specifically described. Thatv which I believe to be new-is set forth in the claims.

On the drawing Fig. 1 is a plan view of one form of the invention, parts of the apparatusbeing-broken away in such'a manner that the right hand side of Fig. 1 markedI-I illustrates a plan of'the complete apparatus, whereas the middle part, marked M is shown with the top covering removed and the left hand side comprising the three left hand wheels is illustrated with also the numeral discs removed.

" Fig. 2 shows a partial vertical longitudinal section through the axes of the numeral discs and Fig. 3 shows a vertical cross section taken through the axis of a numeral (1180.

The calculating apparatus as will be seen object of my invention toing each wheel d as compared with the adjaupon by springs f which serve to hold them yleldingly in certain determnied positions.

On its top surface each numeral disc is provided with the numbers 0 to 9 printed at distances in a circle and radially outwards of the numbers the disc is provided with 6.0 recesses or holes h. The cover-k is provided with segmental slots Z through which the holes It can be seen and further with openings 0 through which can be seen one of the gumbers printed on the top surface of the On the same shaft m as each numeral disc is mounted a gear I) as well as a single tooth or finger 0. Between each air of shafts m and on one side of the line 0 shafts there are mounted toothed wheels d, each adapted-to engage the gear 25' to the left and to be engaged by a tooth c to the right. Each of the gears b is located in the same horizontal plane with the toothed wheel 01 to the right, whereas the toothed wheel d to the left is mounted either. higher or lower so that no engagement can take place. The tooth 0 is mounted so as to engage the toothed wheel d to the left, whereas the toothed wheel (1 to the right lies either above or below it so that no engagement between the tooth and that toothed wheel can take place As will be seen on the drawing the tooth c is integral with gear I), being however bent so as to be out of the' plane of the teeth on said gear 6. The arrangement as above described is efi'ected byinvertingfieachigear b as compared with the adjacent gears 12, and invertcent wheels (I, the gears I) being all alike and the Wheels d-beingall alike whereby thecost of manufacture is kept down.

The toothed wheels (2 are also provided with springs 9 carried by the casing and having their free end-portions in engagement with the teeth of the wheels for holding the wheels yieldingly in predetermined adjusted positions.v As will be readily understood, the springs f and g serve both as justifying means for assuring that the gears b and cl stop in the desired angular positions and also as auxiliary actuating means for the transmission of power from one member to another, as is usual in mechanisms of this type.

By the use of the construction shown, in-

- volving the use of short br'oad tooth portions on the intermediate driving device at for enga'gement by the tooth or finger c of the indicating disc to the right, and the use of comparatively much longer and narrowertooth portions extending beyond the short broad tooth portions in centered position with re.- spect thereto for engaging the teeth of the gear of the indicating disc to the left, I am enabled to provide a structure comprising a comparatively small number of parts so arranged with respect to each other as to have eificient cooperation by which power applied to the indicating disc at the extreme right serving to give said disc one-tenth of a complete rotation may be transmitted through the entire train of mechanism for giving the indicating disc at the extreme left a similar movement comprising'one-tenth'of a com plete rotation. This situation would, of course, I arise when 1 would be. added to On shafts m above the gears 12 there are mounted toothed wheels e, which are adapted to be engaged by a rack 11, which is slidably mounted along one side of the apparatus willbe understood from a description.

of the operation for adding 75 and 25.

First the rack a is reciprocated in order to make sure that all numeral discs are in zerop'osition. Then a stylus is placed in the hole of the right hand or units disc, which corresponds to number 5 in the inner row of numhere on the cover and the disc is turned in clockwise direction in Fig. 1 until the stylus stops at the endof the slot Z. Then the same operation is performed with the second or tens disc, using the hole outwards of number 7 in said inner row, and when this has been done, the number can be seen in the two right hand holes 0 of thecover. To add 25 the operation described above is repeated first with the hole corresponding to the number 5 of the inner row at the.right hand disc and.

s then with the hole corresponding to the numbe1'2 of said inner row on the next disc. The result is to make number 0 visible in the right hand hole 0, and at the same e as the indistep forward so that the number 100 is seen in the three right hand openings 0 of the cover,

In order to move the numeral discs back to zero position after having carried out the addition, the rack a is reciprocated in the manner referred to above. 7

In order-to use this calculating apparatus for subtraction the numeral discs must be turned in the opposite direction, using the rows or" numbers of the slots 1.

In the construction shown, each or" the numeral discs 71. is provided with a single set of indicia from 0 to 9 corresponding to the single tooth 0 carried by the attached gear. I). I do not restrict the invention to the use of a single tooth c, it beingunderstood that a diii'erent number of teeth 0 might be employed with a corresponding number of sets of indicia. Neither is the invention to be limited to the details of construction as shown except so far as the claims may be so limited by the prior art. 7

It will be understood that the arrangement involving the short broad tooth portions and the centrally arranged longer and narrower tooth portionson the intermediate di'ivin devices 11 is provided particularly with re erence to the successful transmission of power through a train comprising a considerable number of indicating be appreciated that the claims are to be construed in the light of the possibilities of the mechanism when used in an extended train of gearing even though the claims are not limited in terms to such use.

Claims r 1. In a device of the class described, the combination of indicating discs rotatably mounted on axes in spaced relation to each other, a gear connectedwith one of said indicating discs for rotation therewith, a finger connected with the other of said indicating discs for movement therewith, and toothed driving means rotatably mounted in operative relation to both said gear and said finger and comprising broad tooth portions with which said finger engages for rotating the driving device and comparatively longer and narrower tooth portions extending beyond the broad tooth portions adapted by engagediscs and gears. It will printed on the cover outside ment with said gear" to drive the gear and connected indicatin disc.

2. In a device 0 the class described, the combination of indicatin discs rotatably mounted on axes in spaced relation to each other, a gear connected with one of said indicating discs for rotation-therewith, :1. er connected with the other of said indicatmg discs for movement therewith in the same plane with said gear, and a toothed driving device rotatably mounted in operative relationship to both said gear and said finger and comprising broad tooth portions of such length as to clear said gear upon the rotation of the driving device but engageable by said finger for actuation of the driving device thereby and comprising also comparatively longer and narrower tooth portions extending outwardly beyond the broad tooth portions in centered relation thereto adapted by engagement with said gear upon the rotation of the driving device to drive the gear and the connected indicating disc.

In testimony that I claim the foregoing as my invention, I have signed my name.

ANDERS EIRIKSON VETHE. 

